package com.xiaoming.utils;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;

import java.util.List;

public class RpcDecoder extends ByteToMessageDecoder {
    private Class<?> clazz;
    private Serializer serializer;
    public RpcDecoder(Class<?> clazz, Serializer serializer) {
        this.clazz = clazz;
        this.serializer = serializer;
    }

    @Override
    protected void decode(ChannelHandlerContext channelHandlerContext, ByteBuf byteBuf, List<Object> list) {
       try{
           if(byteBuf.isReadable()){
               int length = byteBuf.readInt();
               byte[] data = new byte[length];
               byteBuf.readBytes(data);
               Object o = serializer.deserialize(clazz, data);
               list.add(o);
           }
       }catch (Exception e){
           e.printStackTrace();
       }
    }
}
